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- W2071029802 abstract "Abstract In horizontal wells completed as open holes that are irregularly shaped or badly washed-out, or with slotted or preperforated liners, mechanical packers can not be used to isolate a water- or gas-producing zone. Consequently, a new method using chemical packers has been developed and tested. The method involves: (i) setting two chemical wellbore plugs in the horizontal section to straddle the problem zone, (ii) squeezing gel into the problem zone, and (iii) cleaning out the borehole prior to production. Using coiled tubing, the whole operation would be conducted in one roundtrip. The new method was tested using a 60 ft. long horizontal-well apparatus consisting of an outer 12-3/4 in. PVC casing containing two concentric metal screens (ID's 9 in. and 6 in.). Space between the screens was packed with sand, forming a 6-inch wellbore with a 1-1/2 inch thick formation, into which a 4-1/2 inch pre-perforated liner was placed. A gel-placement tool was placed inside the liner. The tool consisted of a 1-1/2 inch tubing to spot/squeeze the formation gel, an internal % inch tubing to spot the wellbore plug, and outer rubber elements for focussed gel placement. Model temperature was set at 110°F by circulating hot water through the apparatus. Two runs were made, each consisting of spotting a 40 ft. long K-MAX wellbore plug, followed by spotting and squeezing PERMSEAL across 20 ft. of the borehole. (From symmetry, the placements represent a dual wellbore plug each 40 ft. long straddling a 40 ft. problem zone). After the formation gel had set, the apparatus was disassembled, showing the chemical plug had completely filled the borehole, strongly adhering to the borehole surface with no slumping. The formation gel penetrated and consolidated the formation. The tests confirmed the viability of the new zone isolation method that is planned for field-testing." @default.
- W2071029802 created "2016-06-24" @default.
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- W2071029802 date "2000-04-03" @default.
- W2071029802 modified "2023-09-27" @default.
- W2071029802 title "Full-Scale Well Model Tests of a New Chemical Plug System for Zone Isolation in Horizontal Wells" @default.
- W2071029802 cites W2006633943 @default.
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- W2071029802 doi "https://doi.org/10.2118/59357-ms" @default.
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